US4674640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cap structure for a centrifuge tube
Assignee: Individual
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Filing: 1986-03-24
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Granted: 1987-06-23
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Expires: 2006-03-24
Abstract
Abstract An improved cap structure for a centrifuge tube including a flat roughened texture surface on the top thereof especially adapted to permit writing thereon with a variety of standard writing instruments.
Inventors
- 👤 Maurice Asa
- 👤 David Asa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:14
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/50; B01L3/502; B01L3/5021; B01L3/54; B01L3/545; B01L3/5457
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
An improved cap structure for a centrifuge tube having a sample receptacle formed therein, said sample receptacle having an open end and the internal walls thereof being cylindrical and extending away from said open end, the cap structure of said tube being secured thereto with a flexible connection and including a projecting portion for fitting inside the open end of said receptacle and a flange extending radially outward around the connection of said projecting portion with the flange of said cap, the improvement comprising the top of said cap structure on the opposite side of the cap from said projecting portion having a flat configuration with a roughened texture surface especially adapted to permit writing thereon with a variety of standard writing instruments and said flexible connection having a flattened center section which causes the material to bend at predetermined positions along the connection to accurately position the cap for insertion in the open end of said receptacle.
Claim 2
Dependent Claim
158 words
An improved cap structure for a centrifuge tube having a sample receptacle formed therein, said sample receptacle having an open end and the internal walls thereof being cylindrical and extending away from said open end, the cap structure of said tube being secured thereto with a flexible connection and including a projecting portion for fitting inside the open end of said receptacle and a flange extending radially outward around the connection of said projecting portion with the flange of said cap, the improvement comprising the top of said cap structure on the opposite side of the cap from said projecting portion having a flat configuration with a roughened texture surface especially adapted to permit writing thereon with a variety of standard writing instruments and said flexible connection having a flattened center section which causes the material to bend at predetermined positions along the connection to accurately position the cap for insertion in the open end of said receptacle.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-22 | 1990-12-22 | 1991-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-22 | 1994-12-22 | 1995-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-22 | 1998-12-22 | 1999-06-23 | $7700.00 | Window Closed / Lapsed |